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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9244bc157771aad809b08ae7ecfee2bad3d7c4ef619f88949ced71f4f8efa5dc' 
  AND token = 'UOkH3Q/t6IVCwaFZM5iZ/QbTjIwO5LFASzAgTIz8hVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}